<script type="text/javascript">
var XMLHttpRequestObject = null;
var onprogress = false;

try{
    XMLHttpRequestObject = new XMLHttpRequest();
}
catch(e){
  try{
    XMLHttpRequestObject =  new ActiveXObject("Microsoft.XMLHTTP");
  }
  catch(e){
  }
}

function startRequest()
{
  if(onprogress){
    alert("Trwa przetwarzanie danych.\nSprbuj ponownie za chwil.");
    return;
  }
  if(XMLHttpRequestObject){
    onprogress = true;
    XMLHttpRequestObject.open("GET", "http://localhost/dane.php");
    XMLHttpRequestObject.onreadystatechange = function()
    {
      if (XMLHttpRequestObject.readyState == 4){
        if(XMLHttpRequestObject.status == 200){
          tekst = XMLHttpRequestObject.responseText;
          var pt1 = document.getElementById("pt1");
          pt1.innerHTML = tekst;
        }
        onprogress = false;
      }
    }
    XMLHttpRequestObject.send(null);
  }
}
</script>